1671345621220 has 48 divisors (see below), whose sum is σ = 3829830278400. Its totient is φ = 607614520320.

The previous prime is 1671345621203. The next prime is 1671345621259. The reversal of 1671345621220 is 221265431761.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11580 + ... + 1828339.

It is an arithmetic number, because the mean of its divisors is an integer number (79788130800).

Almost surely, 2^{1671345621220} is an apocalyptic number.

1671345621220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671345621220 is an abundant number, since it is smaller than the sum of its proper divisors (2158484657180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1671345621220 is a wasteful number, since it uses less digits than its factorization.

1671345621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844068 (or 1844066 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 1671345621220 in words is "one trillion, six hundred seventy-one billion, three hundred forty-five million, six hundred twenty-one thousand, two hundred twenty".